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<a name="Macros-and-Functions"></a>
<div class="header">
<p>
Next: <a href="Identifiers.html#Identifiers" accesskey="n" rel="next">Identifiers</a>, Up: <a href="Tree-overview.html#Tree-overview" accesskey="u" rel="up">Tree overview</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Trees"></a>
<h4 class="subsection">11.2.1 Trees</h4>
<a name="index-tree-1"></a>
<a name="index-TREE_005fCHAIN"></a>
<a name="index-TREE_005fTYPE"></a>

<p>All GENERIC trees have two fields in common.  First, <code>TREE_CHAIN</code>
is a pointer that can be used as a singly-linked list to other trees.
The other is <code>TREE_TYPE</code>.  Many trees store the type of an
expression or declaration in this field.
</p>
<p>These are some other functions for handling trees:
</p>
<dl compact="compact">
<dt><code>tree_size</code>
<a name="index-tree_005fsize"></a>
</dt>
<dd><p>Return the number of bytes a tree takes.
</p>
</dd>
<dt><code>build0</code>
<a name="index-build0"></a>
</dt>
<dt><code>build1</code>
<a name="index-build1"></a>
</dt>
<dt><code>build2</code>
<a name="index-build2"></a>
</dt>
<dt><code>build3</code>
<a name="index-build3"></a>
</dt>
<dt><code>build4</code>
<a name="index-build4"></a>
</dt>
<dt><code>build5</code>
<a name="index-build5"></a>
</dt>
<dt><code>build6</code>
<a name="index-build6"></a>
</dt>
<dd>
<p>These functions build a tree and supply values to put in each
parameter.  The basic signature is &lsquo;<samp>code,&nbsp;type,&nbsp;[operands]<!-- /@w --></samp>&rsquo;.
<code>code</code> is the <code>TREE_CODE</code>, and <code>type</code> is a tree
representing the <code>TREE_TYPE</code>.  These are followed by the
operands, each of which is also a tree.
</p>
</dd>
</dl>






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